linux-kernel - Re: [PATCH 2/2] serial: of_serial: Handle fifosize property

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Message-ID: <20130321132415.GA2902@xps8300>
Date:	Thu, 21 Mar 2013 15:24:15 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, Rob Landley <rob@...dley.net>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/2] serial: of_serial: Handle fifosize property

Hi,

On Thu, Mar 21, 2013 at 07:41:39PM +0800, Ley Foon Tan wrote:
> On Thu, 2013-03-21 at 12:48 +0200, Heikki Krogerus wrote:
> > +	/* Check for fifo size */
> > +	if (of_property_read_u32(np, "fifosize", &prop) == 0)
> > +		port->fifosize = prop;
> > +
> Suggest to use "fifo-size" for the device tree property, to align with
> other DT properties.

I was going to, but then I noticed that in some .dtsi files "fifosize"
is used with uarts. Should I still change it?

> >  	port->irq = irq_of_parse_and_map(np, 0);
> >  	port->iotype = UPIO_MEM;
> >  	if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {
> 
> I think you need to remove the UPF_FIXED_TYPE from port-flags as well to
> use the fifo size from device tree. Otherwise, it will get from the
> static array in 8250.c.

No, it's the other way around. It is picked from the array
conditionally, only in case it was not already set. However, if
UPF_FIXED_TYPE is removed then autoconfig() will override it.

Thanks,

-- 
heikki
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